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Date: Mon, 24 Mar 2008 10:13:23 -0500
From: "Michael Dick" <michael.d.dick@gmail.com>
To: users@openjpa.apache.org, bardolf@seznam.cz
Subject: Re: JPA update entities every (even empty) commit
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Hi Bardolf,

I don't think there's a way to do a partial commit without detaching the
entities you don't want to update. The OpenJPAEntityManager interface
provides some utility methods which detach all entities in a collection,
which might make detaching a set of entities easier though.

Regarding the UPDATE and DELETE issue you're seeing, which version of
OpenJPA are you using? I ran a quick test with v 1.0.1 and I'm not seeing
that behavior.

-Mike

On Sun, Mar 23, 2008 at 12:09 AM, bardolf <bardolf@seznam.cz> wrote:

> Hi Michael,
> thank you for your response, it makes sense for me. My misunderstanding
> came from wrong understanding of persist method. I wrongly assumed, that
> the persist method provides functionality to store selected managed
> objects.
>
> I see now, that all managed objects are updated in DB during commit. Is
> there any possibility to choose just objects I want to update (except
> detaching object I don't want to update)?
>
> When I call remove on a managed (and changed) object, why does UPDATE
> get called before DELETE?
>
>
> Thanks Bardolf
>
> Michael Dick wrote:
> > Hi Bardolf,
> >
> > In the example above you're using an application managed EntityManager.
> > Application managed EMs are considered extended persistence contexts by
> > default (ie the lifecycle of the persistence context can cross
> > transactions).
> >
> > In this environment when you call EntityManager.find() a managed entity
> will
> > be returned. Since the entity is managed any changes you make to it will
> be
> > committed when you commit the transaction.
> >
> > If you don't want the entity to be managed you can call
> EntityManager.clear()
> > which detaches all entities or you can call
> > OpenJPAEntityManager.detach(myEntity)
> > to detach a single instance. The code might look something like this :
> >
> > EntityManager em =
> > javax.persistence.Persistence
> > .createEntityManagerFactory("JavaApplication3PU").createEntityManager();
> > Address ad = em.find(Address.class,1);
> > ad.setMyProperty(xxx);
> >
> > em.clear();  // detach all managed entities
> >
> > // Detach a single entity
> > // OpenJPAPersistence.cast(em).detach(ad);
> >
> > em.getTransaction().begin();
> >
> > // if you decide you want the changes to be made after all uncomment
> this
> > line
> > // ad = em.merge(ad);
> >
> > em.getTransaction().commit();
> >
> > I'm writing this from memory so this might not quite match up.
> >
> > Hope this helps,
> > -Mike
> >
> > On Fri, Mar 21, 2008 at 8:36 PM, bardolf <bardolf@seznam.cz> wrote:
> >
> >> Hi all,
> >> I have following question. Why JPA call updates on all changed entities
> >> during commit even though persist wasn't called.
> >>
> >> [snip]
> >> EntityManager em =
> >> javax.persistence.Persistence.createEntityManagerFactory
> >> ("JavaApplication3PU").createEntityManager();
> >> Address ad = em.find(Address.class,1);
> >> ad.setMyProperty(xxx);
> >> em.getTransaction().begin();
> >> em.getTransaction().commit();
> >> [/snip]
> >>
> >> And even though I didn't call persist, changes are updated in database.
> >> WHY???
> >>
> >> Thanks B.
> >>
> >>
> >
>
>

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